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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f8c62977f109dfd0a677fc1d4116a32e11ab43a330861da540dc054af9de53' 
  AND token = 'G1nAghtjJkFOrcWCDMD/Y625hudlD9qU0HcOugnKAtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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