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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f46263022176e80f886eea763ecb32baa7bca63f86e7a0e9db4b9cac9aa5b6a' 
  AND token = 'kOXdGszM+UtEfcGS2UN0MxwV+lggCMx6CjkeP+XNKgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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