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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfdcd56311f989acb40f41b33a213edbed729cfc9733505db7fbb3a6ea50805' 
  AND token = 'QfuYV+b92O63V5RzxuDj91SRarLp1YFFdjq5bf+Rr0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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