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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaabfdccc19b56708f61506c6a1168b76eb881e03428fa44ed3003cbf68462ab' 
  AND token = 'tLP2/C1ilYDWnkLZ+eN+H7xmjPLqcfe/MkwjsfQ8zHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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