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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04dcc3f08f5e26ceaa4c1b0d725771402152da73a1d031e66b83bef1e1722ef8' 
  AND token = 'tg61keTIujnU0Bf5JKL32TuCVB+xNMYLX1Bm/s8z780=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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