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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77275c9aaeddb4e399c8e34c46651b77fcd35902af00f73a5ed5d36bd9ca271e' 
  AND token = '6g4yFtqcCKSwydmKPSlZ27bG9NXVOaSaMyy2koSGPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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