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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7b5ad8e691ab3906a3a15686074c1a50c1d29a1fcab3c38549bb23adc6861e' 
  AND token = '5sjWYcvAIfmU+hnhaytU7sVDw/NELNegyBSQj+YpSyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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