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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3b21caf8caf9c1e3231540b881a24951733ca3da84a0c54fde4ba7639373e2' 
  AND token = 'Js08nCVc7O2sQ4/plABI1gyKZfVElo4f2u94B4/RZAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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