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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1bf565715ca1337236313cb9c11c26099199353eea071b763a3512dca33133' 
  AND token = 'gRE6chsJhk+9BSCY4AMvN0oSklyewtSWkZBatrNAogM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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