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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35fad3cad4c7a25f15993e5cf1e622d8006001ab74d3f2dac4413eda062955d' 
  AND token = 'kFb6iT65OFpbY+AuDfaTO/YXqITlmhExLqLBxVdE6eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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