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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b67db6ead9b151a6b96a92e928ce84a7a41997fefe4427a83d6f301e3adb254' 
  AND token = 'qCRf2KLRds2WKe/c4W+4Rbtf04WTu3GvmfZmN6eRSqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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