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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b82793a7a5910c1e3028d086e2c400ded262ca14f60c6b4ee20870274d8088' 
  AND token = '5ctPegm/8mfBWCBjR/Qs6L+e+Q56TZrpNM41KyYDMnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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