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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8671c3bdce601355e4e087a885a0b91b51b083841edec3f2a6935ef74bd10636' 
  AND token = 'eNJiuEToz5zh0n9pA1Ufcg/O4ZcyGoCA1Tg6Q7Lou+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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