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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82f42e70236963e7e94bf717a1fa0a40d10f877534d814a3a0740173059580e' 
  AND token = 'P+Ewxcno49QR3oRc4AnsndGo/OMzJj9Cu7pEqGRC26U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}