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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464085a0ff8f17c3f4f71b66d5ed21ecac6f869d855046788f6405a9f7f45313' 
  AND token = 'uiJE22t8+UD5ugEr1vBSL2crgQx58d+jk32QihmT5Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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