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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfd812b3730744715ed6e379eeb6d4fbc89758b8017f475ca5990a47bec77d6' 
  AND token = 'kGdcj5h0JqEifKdCGT721rSJfOaxPI+6H4iHe8m4KN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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