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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af1b0d698042848fdeb953c3a55db4c93b63cea52df71d9172ee5a04000aba4' 
  AND token = 'kPfHANv3M4jYNJHluwIpC4NY7h4T41BMCivnnVs0vps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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