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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869d1ed863b0904e8f09e61cfe35da0e5e0a85b01b4ede73a9a5386eb0fbf04a' 
  AND token = 'VErrYjgqK9suAv7ENh0XAgBZY+VziCxAx7e/aB0/3CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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