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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b7cbb4b5f7472f25cdd5d401f9cc4f3cbb02ef5105c2f603e25b28770f9c73' 
  AND token = 'mry0TRjLJAJiLj8noXmIQ4knUXses+Q6eq+D9Mxfgz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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