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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8263ded80b591dca06a50fda149ff349abff71fe3d1bfa52b45b7e27ec27d57' 
  AND token = 'H9PDfzVxrkwqE47jt36BCnSb8Wa3iPaD26z84XhCfS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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