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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f48050de8fb0aebb184dde9b59d93c0843444cb2d0ed78642e159cf900ba99a' 
  AND token = '0FvUbenZ5MsdIUzUMueZXu8ZE45jEvXe+riGR9xlFpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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