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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283756f53f19902f43601459f6894ae405391ae0f0281d913efc3ab03fcff551' 
  AND token = 'A+CeJjIh6ASPJCIGzY1SYVy8ytPj1f8odAp4+L26Zac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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