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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe504e48403d28b81f977b474e23d90e3c359f64eeeb8bb9d9e781c9a97a3a3' 
  AND token = 'tGag3otZVi573c2T2v+EWNd6yTbtgNU6pYXt0fPM3S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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