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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8a8b42f73b6b60d41bdd858f8acc06b9d69e50a6c8d290abd44df7b682ecbc' 
  AND token = 'n00UVFrpNebhfNbKpaF29e8y3QL8XIBl9uA4BdCJTM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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