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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a2f2551257a47908aadc075706e71f825a0558cacde94054ac8fc1826a0647' 
  AND token = 'kw8Jq1owp3I0cMvKxdFFyoiYXH+fuyrCQGSeqNcbDyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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