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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c826ee1fa0ff58d52bc6d2c482fe4a99bdc820780e7e8fa8b1b3e0cad50103' 
  AND token = 'g0xTGHbXnjGc6a64almKr4Tytb0yDPsvitJDgYK4Peg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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