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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e86264abc0711ce75e75e1877e416d6e5530d16309e122306c31aaa1a1bcd9' 
  AND token = 'PfyiYVZ97sqCrCezyNSBqoNFld/O/qAyPee60NdeOh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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