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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e11a9fbc9a9a2193cb09d62b87ba037990292c0b72c1ba636fafd5c40d5df12' 
  AND token = 'BexaV7+MSQOSIJK7a6uD9aLH1QRskbGXSLr3+KAKekE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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