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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbf44059643a71044f07f2e528b3a96af19f41e841455c0d7c060771b26fbc9' 
  AND token = 'hKDgcC08mojqJtsH4Up255vHcquu+dCqoiXaa1205vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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