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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c859d9141d4b706e625810d13552c4d8bba1f28743b0db4c2f1956a7bc8c8ff0' 
  AND token = 'i1mzT9OkX+gA6nPrTINuhkNo+dqvFckhPvViStE1gmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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