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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3b0b22f9aacbeb8d29b8c1c816e171426ee005e9d5ebf4144868ec0065b758' 
  AND token = '4zFOUxeRdizorwcKIZCP9aFe03Ye2BLMY/T7V6GkmbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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