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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7532a4ef66a7cbf21387fb065899948b96366180333daed3c92641d905968303' 
  AND token = '6yoj4oegzGwS6ltjdnZUwfp3+hIgmc1qHKZXe5Ncs70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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