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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6383f9177f65f62a714bc0a11c46834c94581c6b90d1afdbe3c405145289b890' 
  AND token = '2hpBzF30vXm4mb9RnwxhMxV7wF+6SdDEk0Oe4/8LrCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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