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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b348739540705e8033450ebf04752d20dbed5fc1d44beefbc0144461d4f41d5' 
  AND token = 'xSC9y4Coe5M2xJtu4eUV7aF86Ao4GmSab36innAbDfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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