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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf3f4c88cd1d6ea73ad5acec0ebba98a8f202517bde37b8336018a41221c460' 
  AND token = 'nnIGiZ95E8pnQZ1baPXYw5QwfEF/h3r6RvU0X2AhNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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