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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22a012f53bed67c64185d19f78c9415b2e7e64f3bccfc0c5bc6e02c621e6228' 
  AND token = 'QZbcitIe/fVdpGK9noQFXHi8ZzEz1wc9lKdloxwWBzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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