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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5137d40f903963bff5288f6354b8b0067057858ed1d6e5fd2689fc7521fab68a' 
  AND token = 'obRymhrSilbbOhadyrEoWJYPQCfEfYRN9MKHoIhu7Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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