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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11348db53b015805d4531caa56e46e60b76479204f54c5306abfc9f6934cb554' 
  AND token = '1nUyBlypc3sOtlybiEo3qyafLleI0R297q/n0fELmBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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