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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23906716094bd5cf3c9baebd6962d771bfe7d273cbbc71ea1d607c998e69b6a2' 
  AND token = 'Ps+ine22bSlYSRWXj9JHSBgc2bGpBvnH9br9qgitlWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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