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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296fc32821bea7192cffff1cc8d849f896fd0d78b18cbd9efa7774a92eedc8a6' 
  AND token = 'yV8Uk5jUvppRea+kzN/YFROCAT5guNaLvWlR3EWGIkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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