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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15645a89f8567856257ec7a420caac70285818ad9d17b80a456357a72c55508' 
  AND token = 'FcG4tpq/r0fYsmLr6ZgUcGCkp50VWD5cHs5lQBvZcDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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