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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7118712ee67f6dbeb8d33395ce9dfb8d1fb78c5227cb0f0e2050f12acea3c39f' 
  AND token = 'TPVXYCfPUgOfPCg7O+8xpC37P9tt11mQsExdEd9QYng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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