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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a6d57eca5bc487501808871d36796a83fac82a2f6ef4090442e91933ba2bae' 
  AND token = 'cCE04T73a5KVf5NUBlCqvteAtyuFr2ExtC2TeVRtQ+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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