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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23831af0cbe263ea1e88e7a8ae169b7f5cdf2195b25c797020ec589cb4cad76' 
  AND token = 'WVRzsdbxEemDJpwJZs8UzAq5CpaauV5B0O7zuvhI2bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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