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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57719458e72db8e0d013f80c31c73ad855557033fa2125b04426bedba18137b' 
  AND token = 'G+amyt5qbqGzS/Wh1A3vEAc0piZBGXFTJ64bfAaXeLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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