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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1024196898b0760cd2df7e70d1f65c749dcafc169bd0ae39611f9e573217a8ef' 
  AND token = '+dTgypAScA1FXC4CKtVZ52/bNW+KQ4IWtcpsSeLHLuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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