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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4889ea3890d25d5c242aaa97049456b6722e5ea1229fcdc1aadf067fa707257b' 
  AND token = 'P17fqB9B0l8aqe3gHxmWXJgHIahiZWlz54Pnj9NTwFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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