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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f18932c7b8a34ff576b77e44e9125b0bbf7c3e9a92e5927c96a82d3e4551248' 
  AND token = 'CyvCXQ8snXd9vlTrTOWd6cvN4ro499ZPsHLWN65gSys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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