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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6e8628ad56d6e64011f087b620f7e3a8fab03117264fbb5e29e05b7340ab0d' 
  AND token = '7N+EyXXpdJTZDTKeZmfBA6ymNhudZEv48sCDY2Y+Aco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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