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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85f72168acd38cf5d31761fab5f1519c0432c878c236edb244a1c1a64474d65' 
  AND token = 'D1gwnTnCjUPyQdZd76VQ8mVb3V8HU+NC/7KU720kN3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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