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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1d8c97eedcf18decf06ed42a081469ac4400586e9ffb7255d6d242ba614426' 
  AND token = '7scNLpRPW/EAlqhnNPfdC5wZ7Go0TH8eLrJM1Prd48o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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