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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6a128e5aa2369ec779ab293b308682619e6d634f56e385fd327834432b3153' 
  AND token = 'mFChsKHEN2UXkQkRWQZjE44Rew9TjR5XKm6k8N9+jmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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