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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e7ef1972eb187f0fbfe7998f770b0f02b693604051b13eecaa63526de71536' 
  AND token = 'aM4jVtSfvMRcM8c1FbpfvqGwHuB3yO/lgMbwzKk8yjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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