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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcefb67d8fd2adc279c44d5b718c192b38f114e1924bec97734c052595cab66' 
  AND token = 'Txe/kG1R2v6MqUX6Scq97TC8SICgBBkqDVP3LrjsvTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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