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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce4a01d771e405dbdf8e6f74c9706b16ba936e56b93f99951f726113316875f' 
  AND token = 'HePEk892nr51c7NoZWnntu8R+mV6OuDguL/q/rrAU9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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