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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029f7eef1d49a2306b2b105a01b75802ddabf8f3fea36c31ac8d444c67e36173' 
  AND token = 'QjlMceJ1sltJIgdT0vuM9Nm7W2JJgvcOZcM8jq2C9VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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