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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580e0f3305fe130a655440a710a65b08844dc9c58ba19c1c9040bfe22a30a422' 
  AND token = 'Gh1mxi9T9UTbE3JSH18PzCcYmYan9PhQit/5f/PCqQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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