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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64a877e43f51897a1f670062b2b5194dca7f445c8400bf81c4f8dc1747e5269' 
  AND token = 'UM429ptMQ4t7EtpCFserA1MKzoLsP7GzsAr3j9/V5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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